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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee66e23a70ebe5194ba4f24604042d06febe4b4993b78f0bc8137549ab82255' 
  AND token = 'Y1sBQ+y0MQm2ky8xeQJrM+GX6AWShsNe2TrI5M3jMmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}